4. Communications: electrical
  5. Audible indication
  6. Percussion-type sound producer

David I. Spalding

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Amplitude control for sawtooth wave form

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent

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Current measuring device

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Patent

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Signal sampling and conversion system

Communications: electrical – Audible indication – Percussion-type sound producer
Patent

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Profile ID: LFUS-PAI-P-1176869

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